Matt's suggestions for enjoying audiobooks are dead on. I am partial to non-fiction as I don't trust the tone or timing of most people with fiction. But iTunes usually gives me a pretty good idea on what to expect.
I have two more links for audiobooks you might enjoy. Free and nearly free ones. First, there's the Project Gutenberg audiobooks read by computers or people. I'm not so sure I want Zarvox reading my Mark Twain, but I do like the concept.
Next there's the Telltale Weekly that is very close to free (starting at 25¢ a book).